Chapter 1: Product Features
December 31, 2007 AT Commands Reference Manual 1-11
Features and Benefits
The following algorithm related features are provided:
Sidetone
Sidetone reduces the microphone audio input that is routed to the selected speaker so that the
person speaking can hear himself or herself talking. This creates a slight echo because the speaker
sound then gets picked up again by the microphone and is again routed to the speaker, and so on.
Echo suppress is designed to take care of this echo.
Figure 1-2: Sidetone
Echo Suppression
Echo suppression suppresses a large amount of the output sound picked up by the input device
(cancels all echoes).
Figure 1-3: Echo Suppression
Mic
Spkr
Echo
G24
Remote
1
5
Mic
Out In
Out line is filtered
by In line
Spkr
3
4
2
Problem
Loop
1
2 3 4 5
Solution
(
(
4
3 1
Suppression
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